MDEV-36486 Optimizer hints are resolved against the INSERT part of INSERT..SELECT

When processing queries like
  INSERT INTO t1 (..) SELECT .. FROM t1, t2 ...,

there is a single query block (i.e., a single SELECT_LEX) for both INSERT and
SELECT parts. During hints resolution, when hints are attached to particular
TABLE_LIST's, the search is performed by table name across the whole
query block.
So, if a table mentioned in an optimizer hint is present in the INSERT part,
the hint is attached to the that table. This is obviously wrong as
optimizer hints are supposed to only affect the SELECT part of
an INSERT..SELECT clause.

This commit disables possible attaching hints to tables in the INSERT part
and fixes some other bugs related to INSERT..SELECT statements processing

sql/sql_insert.cc

@@ -1647,7 +1647,7 @@ static bool mysql_prepare_insert_check_table(THD *thd, TABLE_LIST *table_list,
                                     table_list,
                                     thd->lex->first_select_lex()->leaf_tables,
                                     select_insert, INSERT_ACL, SELECT_ACL,
-                                    true, true))
+                                    true))
     DBUG_RETURN(TRUE);
 
   if (insert_into_view && !fields.elements)